FX II Short Range Scope Free low-poly 3D model is available on CGTrader for free. Original author: pres-trenary. Specs: 5178 polys, 2834 verts.
FBX (Autodesk FBX, filesize: 73.3 MB), TEXTURES (Textures, filesize: 73.1 MB), PNG (PNG, filesize: 73.1 MB)